Truffles are one of the most sought-after foods in the world. People use specially trained animals to sniff out this delectable fungus on tree roots, and a pound of white truffles can sell for thousands of dollars. But there’s a dark side to this delicacy. We talk to journalist Ryan Jacobs about his new book, The Truffle Underground. And he’s got all the dirt: theft, fraud, poisoned dogs, and even murder.